Induction supply-meter for polyphase electric currents.



H. ARON.

INDUCTION SUPPLY METER FOR POLYPHASE ELECTRIC GURRENTS.

APPLICATION FILED JULY 28,1908.

944, 1 67. Patented Dec. 21, 1909.

electric currents, in accordance with the Aron HERMANN ARON, FCHARLOTTENBURG, GERMANY.

I To all whom 'it may concern:

Be it known that I, HERMANN ARON, Ph. D., electrician, citizen ofGermany, subject of the Kin of Prussia and Emperor of Germany, resi ingat Charlottenburg, near Ber] in, in the Kingdom of Prussia and Empire ofGermany, have invented new and useful Improvements in Induction Supply-Meters for Polyphase Electric Currents, of which the following is aspecification.

Induction supply meters for polyphase system of connections, comprisetwo sets of driving coils each of which acts on a disk of aluminiumusually carried on one arbor or shaft. Hitherto the pressure coils ofeach set have been arranged on separate iron cores and, inconsequence ofthe sets being disposed one above the other, the apparatus has occupieda considerable space. According to my present invention among otheradvantages I reduce the space occupied by making the iron cores of theelectro-magnets of both sets in one piece, or by connecting them so thatthey :form practically one piece, in such a manner that the lines ofmagnetic force of both sets pass partly together through the sameportion of the iron. A simple arrangement according to this inventioncan be made if the iron cores of the sets be U shaped and be connectedtogether so that they form an H shaped body on the two upper limbs ofwhich the coils of one of the sets are carried, while the coils of theother set are carried on the two lower limbs, the cross-piece formingthe portion through which the lines of magnetic force-of both sets pass.The H shaped body can however be made in one piece, or in two, or more,pieces, as desired. I

The accompanying drawing illustrates a Specification of Letters Patent.

Application filed July 28, 1908. Serial No. 445,825.

Patented Dec. 21,1909.

construction in accordance with my invention. In this drawing the seriescoils are marked a and the pressure coils are marked 6. The H shapedelectro-magnetic core com- *mon to both sets is marked eand itscrosspiece 0. The aluminium disks are marked d and their common shaft orarbor f.

-Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed I declare thatwhat I claim is 1. In an induction supply meter for polyphase electriccurrents having two sets of driving coils disposed one above the otherand comprising series coils and pressure coils for both sets, iron coresfor the pressure coils of both sets, said cores of both sets consistingof one H-shaped body having a part which constitutes a passage for thelines of magnetic force of both of the said sets, and a driving disk foreach set.

2. In an induction supply meter for polyphase electric currents havingtwo sets of riving coils disposed one above the other and comprisingseries coils and pressure coils for both sets, an H-shaped iron bodyforming the cores for said pressure coils, the coils of one of the setsbeing carried on the two upper limbs of said H-shaped body and the coilsof the other set on .its two lower limbs, the cross-piece of saidH-shaped body forming a portion through which the lines of magneticforce of both sets pass, and a driving disk for each set.

In testimony whereof I have hereunto set my hand in presence of twosubscribing wit-.

nesses.

. HERMANN ARON.

Witnesses: I

WOLDEMAR HAUr'r, HENRY HAsrER.

